LE and Memory transistor cost?

Question

Hey,

I have 4 design options .. each taking different number of LEs and Memory space .. I need to relate them to each other in terms of hardware cost and compare .. (i am using cyclone II)

In order to do that, i need a unifying metric, that is:

1. How many transistors does an LE have, and 1 bit of memory have?

or

2. total area occupied by LE to total area of 1Kb of memory ..

I prefer the first one for the second is mostly used in ASICs ..

where can I find this information?

thanks

altera_forum · Answer

Hi,

Which link are you referring to? you forgot to attach the link .. however, I found this paper from Altera, it shows that in the Cyclone EP1C20, it seems that the logic fabric is 5 times the area as that of the memory fabric ..

pdf file (http://www.altera.com/literature/cp/cyclone-lc-hp-fpga-423.pdf?gsa_pos=4&wt.oss_r=1&wt.oss=die%20area%20cyclone%20ii)

regards,

altera_forum · Answer

--- Quote Start ---

seems that the logic fabric is 5 times the area as that of the memory fabric ..

--- Quote End ---

You can also calculate from the numbers given in the paper, that the area occupied by one LE is about 70 times the area of a memory bit.

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LE and Memory transistor cost?

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